Mac shuts down after 10 Min.

My mac shuts down automatically after 10 Min., I must sign in again and the movie or whatever I just watch is still on in the back.
How can I prefend this cutoff?
I read all the comments, but no help. Even if I turn off the Mac or unplug it, it does not help.

No, did not help. I take it to the store. Thanks anyway.
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It's around $135, but look at [welovemacs.com] and see what they charge. You can also look at [http://www.synaptech.com/catalog> or [http://www.dttservice.com/imacg5.html] to see what they say.
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